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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>vlinkColor null</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    document.vlinkColor = null;
    document.getElementById("out").textContent = [
      "=== empty string: " + (document.vlinkColor === ""),
      "JSON: " + JSON.stringify(document.vlinkColor)
    ].join("\n");
  </script>
</body>
</html>

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Document.vlinkColor — null to empty (Try It)